Synopsis:Inspector Cheng Ao-chun, a Taiwan sharpshooter, is on a mission to
investigate an Underground Arsenal on Hai Han Island in Hong Kong. As it
has been regarded as a base of co-ordinating all arms deals, Public
Security Officer Hua Chun Yung, a nimble fighter from China, is on the
same mission. Thus, the two become undercover agents inside the
Syndicate. In one arms deal, Cheng and Hua have their identity exposed
by Hong Kong Inspector Yeung. Despite the Hong Kong government
authorities wish to repatriate them, the two insist to stay on security
grounds, Hong Kong government submits but has asked Yeung spy on their
movements secretly in the territory. However, the three with different
backgrounds confront against each other. Hua gets acquainted and falls
in love with Edna, who is the sister of ringleader, Marco. On the other
hand, Hua tries to trap Marco through their relationship. Marco is
eventually arrested during a fight with Yeung. The four are in deep
emotion, as Yeung and Edna see Cheng and Hua off on their homeward
journey.